var createError = require('http-errors');
var express = require('express');
var path = require('path');
// var cookieParser = require('cookie-parser');
var logger = require('morgan');
var app = express();
var fs = require('fs')

// view engine setup
// app.set('views', path.join(__dirname, 'views'));
// app.set('view engine', 'pug');

app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
// app.use(cookieParser());
// app.use(express.static(path.join(__dirname, 'public')));

//allow custom header and CORS
app.all('*', function(req, res, next) {
  res.header('Access-Control-Allow-Origin', '*');
  res.header(
      'Access-Control-Allow-Headers',
      'Content-Type, Content-Length, Authorization, Accept, X-Requested-With'
  );
  res.header(
      'Access-Control-Allow-Methods',
      'PUT, POST, GET, DELETE, OPTIONS'
  );

  if (req.method == 'OPTIONS') {
      res.send(200);
  } else {
      next();
  }
});

// 加载路由
fs.readdirSync('./routes').forEach(filename =>{
  app.use('/mock', require(`./routes/${filename}`))
})


// catch 404 and forward to error handler
app.use(function(req, res, next) {
  next(createError(404));
});

// error handler
app.use(function(err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};
  // render the error page
  res.status(err.status || 500);
  res.send({});
});

module.exports = app;
